Flabs

flabs turns any browser into an interactive physics lab with an AI assistant. No hardware, no installation, no cost. Students explore real physics by doing, not watching.

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posted an update —

# flabs v1.0.0 — pi SDK powered physics playground

TL;DR: Complete rewrite. Browser-only agent removed, server-side pi SDK agent in. Private accounts. Private spaces.

## What changed

Before: Browser-only AI agent with hand-rolled provider configs. API key in browser → direct to OpenAI/Anthropic. Server saw nothing. Fragile — every provider had to be implemented separately.

After: pi SDK agent loop on the server. Provider list from pi SDK ModelRegistry (35+ providers, auto-maintained). Browser is just a UI bridge.

## Private accounts

  • Recovery code instead of email/password
  • HttpOnly session cookie (SameSite=Strict, Secure)
  • API key never in localStorage — only in sessionStorage, for one agent turn only
  • Private spaces: nobody but you can see them

## Agent can build

The pi SDK agent runs with 3 custom tools:

  • space_read_file — read sketch.js, index.html, experiment.json, sources.json
  • space_write_file — write new lab files
  • space_list_files — list allowed files

No shell. No network. No CDN scripts.

## Caveat (demo)

Runs on Render Free → no persistent disk → accounts/spaces are temporary. Upgrade to Starter ($7/mo) + Persistent Disk = everything sticks.

## Tech

  • pi SDK @earendil-works/pi-coding-agent (runtime)
  • Express + pi SDK agent loop
  • Typebox for custom tool schemas
  • Render + GitHub auto-deploy

## Links

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